Fuel cell stack

Abstract

The invention relates to a fuel cell stack having a variety of individual cells stacked up to form a stack, having at least one humidifier section integrated into the stack and arranged at one end of the individual cells as an electrochemical section. The invention is characterized in that a heat exchanger section is arranged on the side of the at least one humidifier section facing away from the electrochemical section, wherein flow plates for distributing fluids in at least three sections of the stack have the same external geometry.

1 . A fuel cell stack having a variety of individual cells stacked up to form a stack, having at least one humidifier section integrated into the stack, which is arranged at one end of the individual cells as an electrochemical section,
 wherein on the side of the at least one humidifier section facing away from the electrochemical section, a heat exchanger section is arranged, wherein flow plates for distributing fluids in the at least three sections of the stack have the same external geometry,   wherein in the heat exchanger section, thermally conductive, temperature-resistant foils are arranged between two flow plates, through which the inflowing gas and outflowing gas flow alternately.   
     
     
         2 . The fuel cell stack as claimed in  claim 1 ,
 wherein   flow occurs through the flow plates of each section in parallel and flow occurs through the at least three sections in series, wherein inflowing, compressed air flows first through the heat exchanger section, then through the humidifier section, and then through a cathode side of the electrochemical section.   
     
     
         3 . The fuel cell stack as claimed in  claim 1 ,
 wherein   the connection openings of the flow plates of the at least three sections have the same geometry, wherein distributor plates for the media are arranged between the sections.   
     
     
         4 . canceled. 
     
     
         5 . The fuel cell stack as claimed in  claim 1 ,
 wherein   membranes which are permeable to water vapor are arranged in the humidifier section between each two flow plates, through which the inflowing gas and outflowing gas flow alternately.   
     
     
         6 . The fuel cell stack as claimed in  claim 5 ,
 wherein   two of the flow plates which each have cooling medium channels on their back are combined to form a structure, on one side of which the inflowing gas flows and on the other side of which the outflowing gas flows.   
     
     
         7 . The fuel cell stack as claimed in  claim 1 ,
 wherein   the flow plates of the heat exchanger section and/or the humidifier section have flow fields, in particular similar to the flow fields in the electrochemical section, wherein the flow fields on each of the surfaces are connected to different connection openings and are alternately stacked with membranes and/or foils arranged in between.   
     
     
         8 . The fuel cell stack as claimed in  claim 1 ,
 wherein   the humidifier sections and heat exchanger sections are arranged at one end of the electrochemical section.   
     
     
         9 . The fuel cell stack as claimed in  claim 1 ,
 wherein   the humidifier sections and heat exchanger sections are arranged at both ends of the electrochemical section.   
     
     
         10 . A use of a fuel cell stack as claimed in  claim 1  for providing electrical power in an at least partially electrically driven vehicle. 
     
     
         11 . The fuel cell stack as claimed in  claim 2 , wherein the connection openings of the flow plates of the at least three sections have the same geometry, wherein distributor plates for the media are arranged between the sections. 
     
     
         12 . The fuel cell stack as claimed in  claim 2 , wherein membranes which are permeable to water vapor are arranged in the humidifier section between each two flow plates, through which the inflowing gas and outflowing gas flow alternately. 
     
     
         13 . The fuel cell stack as claimed in  claim 3 , wherein membranes which are permeable to water vapor are arranged in the humidifier section between each two flow plates, through which the inflowing gas and outflowing gas flow alternately. 
     
     
         14 . The fuel cell stack as claimed in  claim 3 , wherein membranes which are permeable to water vapor are arranged in the humidifier section between each two flow plates, through which the inflowing gas and outflowing gas flow alternately. 
     
     
         15 . The fuel cell stack as claimed in  claim 2 , wherein the flow plates of the heat exchanger section and/or the humidifier section have flow fields, in particular similar to the flow fields in the electrochemical section, wherein the flow fields on each of the surfaces are connected to different connection openings and are alternately stacked with membranes and/or foils arranged in between. 
     
     
         16 . The fuel cell stack as claimed in  claim 3 , wherein the flow plates of the heat exchanger section and/or the humidifier section have flow fields, in particular similar to the flow fields in the electrochemical section, wherein the flow fields on each of the surfaces are connected to different connection openings and are alternately stacked with membranes and/or foils arranged in between. 
     
     
         17 . The fuel cell stack as claimed in  claim 3 , wherein the humidifier sections and heat exchanger sections are arranged at one end of the electrochemical section. 
     
     
         18 . The fuel cell stack as claimed in  claim 5 , wherein the humidifier sections and heat exchanger sections are arranged at both ends of the electrochemical section. 
     
     
         19 . The fuel cell stack as claimed in  claim 6 , wherein the humidifier sections and heat exchanger sections are arranged at both ends of the electrochemical section. 
     
     
         20 . The fuel cell stack as claimed in  claim 7 , wherein the humidifier sections and heat exchanger sections are arranged at both ends of the electrochemical section. 
     
     
         21 . A use of a fuel cell stack as claimed in  claim 2 , for providing electrical power in an at least partially electrically driven vehicle.